fix: mark Codex MCP resources as supported

[qqii]

Codex supports listing and reading MCP resources, but its client record currently omits resources, causing the README table to display resource support as unavailable. Add "resources": {} to the Codex record and regenerate the README table.

Evidence from OpenAI's source at commit 51d45620702cd3c825d3520ddc7d7e8052a16b87:

• list_mcp_resources handler exposes resource listing to the model and calls the MCP resource-list operation.
• read_mcp_resource handler reads resource contents by server and URI.
• Resource integration test covers listing, template discovery, and reading. Inspected, not run locally.

A live Codex session with MyDataValue also listed 22 resources and successfully read a Markdown resource. No subscription or list-change support is asserted. The separate codex-mcp-client record is left unchanged pending verification of its identity/scope.

Validation: npm run build (includes capability validation and TypeScript compilation), JSON sorting checked with the CI jq expression, README regenerated with npm run generate-table, and git diff --check.